As per your instruction, i have installed the same plugin on the subsitehttp://classifiedads.konkanconnect.com/ . Im able to activate the WPMU dashboard, but when i try to activate the usersync it shows "This site is not enabled for one-click installations. You may change which sites are enabled or upgrade to a higher membership level here »".

I can see that your current membership level is limited to only one domain for our one-click install thru WPMUDEV dashboard that's why you can't install the user sync plugin on your second site but the said plugin is yours to keep. You just need to manually install and activate the plugin into your other sites.

Unfortunately, the plugin only syncs the users, it does not provide any Single sign on ability. That isn't so easy without 3rd party scripts such as Active Directory or LDAP etc.

From looking at your sites though, would creating a multisite work better for you? as they are both on the same domain, a multisite could easily manage this for you, it would allow multiple sites that shared the same code base. and would already follow the format of how you have the single sites.

No, with multisite, all users are network users & each subsite shares the same database so the user sync plugin is not needed. Users will still need to be added to each subsite, but there's a plugin that can do this automatically. https://wordpress.org/plugins/join-my-multisite/

Then when a user is logged in on one, they will be logged in on all other subsites.

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